Geometry of percolating monopole clusters

We perform detailed measurements of the geometrical characteristics of the percolating cluster of the magnetic monopole currents in the confining phase of the lattice SU(2) gluodynamics. The Maximal Abelian projection is used to define the monopoles. The use of the geometrical language is motivated by recent observations that the full non-Abelian action associated with the monopoles corresponds to point-like particles on the currently available lattices. Scaling behavior of various quantities is observed.Comment: 3 pages, 4 figures, Lattice2002(topology

Building high availability central data catalog service powered by IBM Mainframe technology in the ukrainian national grid-infrastructure

Проведено аналіз особливостей застосування служб рівня кооперації української національної грід-інфраструктури, зокрема служби центрального каталогу даних LFC. Сформовано вимоги до реалізації високодоступного центрального каталога даних із використанням високонадійного обчислювального комплексу IBM Mainframe Z800. Показано особливості апаратної архітектури z/Architecture та програмного забезпечення проміжного рівня Nordugrid ARC, що були враховані при розробленні методики формування високодоступної служби LFC. Методику впроваджено для побудови системи з використанням мейнфрейму та обчислювального кластеру Київського національного університету імені Тараса Шевченка. Техніку формування опису грід-завдання для використання конфігурації високонадійної служби запроваджено до реалізації грід-порталу віртуальної лабораторії MolDynGrid в українській національній грід-інфраструктурі.Analysis of cooperation level service applications in Ukrainian national grid-infrastructure is conducted focusing on LFC central data catalog services. Methods for building high available central data catalog service employing IBM Z800 Mainframe installation are presented. Specialities of zSeries hardware architecture and Nordugrid ARC middleware software were taken into account for service implementation on top of the mainframe and HPC cluster of Taras Shevchenko National University of Kyiv. Grid job description generation technique for accessing high available LFC service was applied to the implementation of MolDynGrid Virtual Laboratory grid-portal in the Ukrainian national grid-infrastructure

SU(2) Gluodynamics and HP1 sigma-model embedding: Scaling, Topology and Confinement

We investigate recently proposed HP1 sigma-model embedding method aimed to study the topology of SU(2) gauge fields. The HP1 based topological charge is shown to be fairly compatible with various known definitions. We study the corresponding topological susceptibility and estimate its value in the continuum limit. The geometrical clarity of HP1 approach allows to investigate non-perturbative aspects of SU(2) gauge theory on qualitatively new level. In particular, we obtain numerically precise estimation of gluon condensate and its leading quadratic correction. Furthermore, we present clear evidences that the string tension is to be associated with global (percolating) regions of sign-coherent topological charge. As a byproduct of our analysis we estimate the continuum value of quenched chiral condensate and the dimensionality of regions, which localize the lowest eigenmodes of overlap Dirac operator.Comment: 22 pages, 18 ps figures, revtex4. Replaced to match published version (PRD, to appear

Nonlinear pendulum's oscillations of load on flexible suspensionat different modes of rotation

Досліджено нелінійні маятникові коливання вантажу на канаті крана у процесі його обертання навколо осі.The nonlinear pendulum's oscillations of load on the crane's rope during its rotation about axes are discussed

Application of clayless drilling fluids under conditions of high reservoir pressures and temperatures

The paper considers the application clayless drilling fluids under conditions of great depths, high reservoir pressures and temperatures. It was determined that increasing the density of clayless drilling fluids by conventional weighting agents is accompanied by increasing rate of bottomhole filtering. It is shown that the solution of this problem is possible through the use of water-soluble salts. The results of laboratory and field tests for clayless drilling fluids weighted with water-soluble salts are presented